You can use var_dump or print_r to see what your models look like. If you want to quickly do it for all models, modify AppModel to have it dump the structure when each model loads.
class AppModel extends Model {
function __construct($id = false, $table = null, $ds = null) {
parent::__construct($id, $table, $ds);
$this->log("Model [{$this->name}] belongsTo = " . print_r($this->belongsTo, true), LOG_DEBUG);
$this->log("Model [{$this->name}] hasOne = " . print_r($this->hasOne, true), LOG_DEBUG);
$this->log("Model [{$this->name}] hasMany = " . print_r($this->hasMany, true), LOG_DEBUG);
$this->log("Model [{$this->name}] hasAndBelongsToMany = " . print_r($this->hasAndBelongsToMany, true), LOG_DEBUG);
}
}